A TACTIOVISUAL EXIT FINDING SYSTEM FOR AIRCRAFT CABINS AND THE LIKE

Abstract: A tactiovisual exit finding system is provided with a collection of tactilely and visually recognizable vees (220, 230, 240, 260, 290) to direct occupants of structures, such as aircraft and public buildings, to the nearest appropriate exits. Since these vees (220, 230, 240, 260, 290) are recognizable by touch and sight, they are effective at any level of visibility including the smoke-compromised equivalent of total darkness. These vees are incorporated into the main aisle and exit passageway floors of such structures where they are tactiovisually addressable by persons walking, crawling, or anything in between. The system also utilizes tactiovisually distinctive upholstery on the seats that flank exit passageways to further identify such passageways.

Description: A TACTIOVISUAL EXIT FINDING SYSTEM FOR AIRCRAFT CABINS AND THE LIKE BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to exit finding systems and mo particularly to exit finding systems that are both tactilely a visually effective when illumination is adequate and tactile effective when it is not. 2. Prior Art The exit finding systems of present commercial aircraft the overhead and exit-proximal signs and the floor lighting, latter intended to satisfy 14 CFR 25.811 Cc) , "Means must provided to assist the occupants in locating the exits conditions of heavy smoke.", when the former are obscured by t smoke. While floor lighting clearly addresses situations in wh the signs are obscured by smoke but the floor lighting is not, clearly fails to address situations in which the floor lighting obscured by smoke, eye irritation, or visual impairment, or which the floor lighting system itself fails.. Thus any self-guiding system expected to be effective b when vision is compromised and when it is not must also invoke s other sense, and such systems are found in facilities for blind, where tactiovisual aids abound, and tactiovisual lavat signs, to cite one example, serve the blind tactilely and sighted visually. Such aids, however, are not intended for, will not effectively serve persons whose vision is compromised eye irritants and smoke, and who must find an exit while crawl "on all fours" in an attempt to get below the heavi -z- Tactiovisual aids are also familiar items in aircr cockpits, where critical knobs, switches, actuators and contr are so coded in the hope of preventing a catastrophe caused b pilot inadvertently "pressing the wrong button". Tactiovisual e finding aids are not found in aircraft cabins, however, altho such aids could save lives by facilitating evacuation when vis dependent exit finding aids are obscured by smoke. SUMMARY OF THE INVENTION According to the present invention I have developed passi tactiovisual exit finding systems that are both tactilely a visually effective when illumination is adequate and tactile effective when it is not. According to a first preferred embodiment of the inventio the floors of the passageways to the exits in an aircraft cab have passive tactiovisual exit passageway identifiers that a spaced arrays of vee-shaped strips that are both tactilely a visually distinguishable from the flooring or floor coveri material between them. These arrays protrude a part of the w into the main passenger aisle so that passengers in that aisle c find these protruding parts, and thus the exits, by sight whe possible, and by touch otherwise. The apices of the vees poi toward the exits to confirm direction, and the exit passagew identifiers protrude only part of the way into the main aisle avoid ambiguity with respect to direction when exits are opposite ends of the same rows. According to a second preferred embodiment of the inventi the main passenger aisle also has a spaced array of vee-sha strips that are both tactilely and visually distinguishable f the flooring or floor covering material between them. The api of these main aisle vees point the way to the nearest appropri exit, and facilitate evacuation by making clear the direction that exit. According to a third preferred embodiment of the inventi the parts of exit passageway flanking seats that face th -4- passageways are upholstered in a material tactiovisua distinguishable from the other upholstery in the aircraft, maki these seats and the passageways they flank visually identifiab from just about any part of the passenger cabin when conditions a right, and locatable by touch alone otherwise. The tactiovisual exit finding system of this invention h advantages over the prior art, the most important of which is exit finding system that is effective at any level of visi including the smoke-compromised equivalent of total darknes Because it is effective at any level of vision, it also serves t visually impaired regardless of the level of impairment. A second important advantage of the exit finding system this invention is its universality. Anyone who can follow the ve can find the exits in any structure having the system. A third important advantage of the exit finding system of t invention is its cost effectiveness. Since seats are upholste and floors have flooring or floor covering material anyhow, incremental cost of upholstering seats and installing floors floor covering material in accordance with this invention w aircraft or other structures are built or refurbished negligible. Further, because the system is a passive one that maintained by normal cleaning operations, incremental maintena costs are nil. Another important advantage of the exit finding system of t invention is its compatibility with, and its complementarity w respect to, prior art exit finding systems. These prior systems of overhead signs and floor-based illumination complemented by the tactiovisual exit passageway seats identifiers and the tactiovisual main aisle guide strips of t present invention, and these main-aisle-centered guide strips a compatible with the prior art floor-based illumination which typically strip lighting offset with respect to the center of t main aisle. These, as well as other features, modifications, a advantages of the tactiovisual exit finding systems of the prese invention will now be more fully described with reference to t annexed drawings of the preferred embodiments thereof. -6- BRIEF DESCRIPTION OF THE DRAWINGS In the drawings: FIG. 1 is a plan view of the interior of the cabin of hypothetical passenger aircraft illustrating the floor-base tactiovisual exit passageway identifiers in accordance with th present invention; FIG. 2 is a plan view of the interior of the cabin of hypothetical passenger aircraft illustrating the floor-base tactiovisual exit passageway identifiers and the floor-base tactiovisual main aisle guide strips in accordance with the prese invention ; FIG. 3A is a side elevational view of the aisle side of a aisle seat facing an exit passageway and in accordance . with t present invention; FIG. 3B is a Front elevational view of the seat of FIG. 3A; FIG. 30 is a plan view from above of the seat of FIG. 3A; FIG. 4A is a side elevational view of the aisle side of t exit passageway seat opposite the seat of FIG. 3A and in accordan with the present invention; FIG. 4B is a rear elevational view of the seat of FIG. 4A; FIG. 4C is a plan view from above of the seat of FIG. 4A; and FIG. 5 is a sectional view of the flooring or floor coveri material that becomes the tactiovisual exit passageway identifie and main aisle floor strips of the present invention. -7- OETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment of FIG. 1 is a hypothetical commerci passenger aircraft, and the drawing shows not only the seati arrangement for such an aircraft, but also the minimal preferr tactiovisual exit finding system of this invention. Passenger seats for this hypothetical aircraft, shown squares in the drawing, all face forward and are identifi conventionally, so that the first seat in the first row is seat and the last seat in the last row is seat 15E as shown. Emergen evacuation of this hypothetical aircraft is via passenger emerge exits at the port and starboard ends of the passageways betw seat rows 9 and 10, at the port end of the passageway between s rows 12 and 13, at the tail cone exit, and also, of course, via port and starboard forward passenger entrance doors 105, 115. This invention is intended to facilitate safe and ra evacuation of aircraft under conditions of cabin visibility rang from normal to the smoke-impaired equivalent of total darkness, does so by means of the floor-based tactiovisual exit passage identifiers 110, 120, 130, 140, 150, and 150, each serving one the previously mentioned exits. Each of these passage identifiers, preferably an integral part of the cabin fl covering Cor the floor itself if that floor is left uncovered), alternately mat-like and attached to that floor, is preferably array of straight legged 90 degree apex angle vees, the apices which point to their respective exits as shown. These vees are, course, the tactiovisual elements of these passageway identifie and are preferably made more recognizable visually by color -8- shade selection that not only maximizes the visual contrast betwee the vees and the spaces between them, but also the contrast betwe these identifiers and the adjacent portions of the cabin floor. These vees are also the tactile elements of the passagewa identifiers, and are preferably made more recognizable tactilely b vee surfaces the textures of which are rough enough to recognized not only with the bare hand, but also through a sho Because the tactile features of this invention become mo important than the visual ones under the smoke conditio previously mentioned Cor for a passenger that is visiual impaired), tactile contrast between the vees and the spaces betwe them, and between the passageway identifiers and other tactile addressable portions of the floor is also preferably maximize Floor treatments that are tactiovisuaUy effective for purposes this invention are considered further in the description of FIG. 5. Returning to FIG. 1, floor-based tactiovisual exit passagew identifiers 110, 120, 130 140, and 150 are shown protruding part the way into the main aisle, an arrangement that is preferr because it makes them easier to find. Further, a well-defin space, preferably at least the width of a shoe, has been le between the inboard ends of identifiers 110, 120, and also betwe the inboard ends of identifiers 130, 140. These spaces elimina the confusion with respect to which way to turn that cou otherwise occur when vision is compromised and a passenger fin abutting identifiers with his hand or his foot, and is preferab included where appropriate in all embodiments of this invention. -9- The embodiment of FIG. 2 is a hypothetical commerci passenger aircraft having not only the minimal preferr tactiovisual exit finding features of FIG. 1, but also floor-based tactiovisual main aisle guide strip 290 that, alo with the appropriate floor-based tactiovisual exit passagew identifier, leads a passenger directly from his seat row to t nearest appropriate exit. As a first example of this consider the passenger in seat 15 Assuming adequate lighting, this passenger will see the a pointing vees of guide strip 290 Cor some other exit markers) a follow them to tail cone exit passageway identifier 260 and thus the tail cone exit. Under conditions approaching zero visibili that passenger would feel for guide strip 290, check the vees confirm direction to the nearest appropriate exit, and walk crawl to the aft end of guide strip 290 where gap 296 marks t inboard end of identifier 260, and thus a direct passageway to t tail cone exit. Next consider the passenger in seat 7B. Under conditio approaching zero visibility this passenger too would feel for gui strip 290, check the vees to confirm direction to the neare appropriate exit, and walk or crawl aft along the strip to gap 2 which marks the inboard ends of the pair of exit passage identifiers 230, 240. Here, however, the identifiers and th corresponding direct passageways to exits are perpendicular to guide strip, and the passenger is led to discover one or the ot of these pasageways rather than the continuation of guide strip by making gap 294 long and the distance from the guide strip to exit passageway identifiers short. - 10- Guide strip 290 also has additional gaps 292 and 295, and should now be clear from this description and the drawing that ex passageway identifiers can be found at gaps in the main aisle gui strip of the hypothetical aircraft of FIG. 2, a convention that preferably retained when practicing this invention. Now consider the passengers in seat row 11. These passeng are substantially the same distance from the nearest exit forw that they are from the nearest exit aft and could use either o but because these passengers would know that those in the immediately forward are exiting directly from that row in emergency and would want to follow suit, they are directed to emergency exit immediately forward. To accommodate th passengers entering the main aisle from seat row 11 find at th feet guide strip vees pointing forward. Passengers in seat row are closer to the nearest exit aft, however, and are directed that exit by the aft-pointing guide strip vees they find at th feet as they enter the main aisle. Since the guide strip vees must change direction to serve passengers in both seat row 11 and seat row 12, it is clear that lieu of gaps, which serve the purpose mentioned earlier, vees w abut to form the diamond pattern 29S. The other "diamonds", and 299, are explained analogously. While the "diamonds" in hypothetical aircraft of FIG. 2 have been positioned on the ba of reasoning alone, actual positioning for a real or plan aircraft would, of course, be confirmed by evacuation drills. The embodiment of FIG. 3 is the aisle seat in an exit row, seat 10C in FIGS. 1 and 2; FIG. 3A being that seat as viewed f the aisle, FIG. 3B that seat as viewed from the passageway lead - 1 1 - to the exit, and FIG. 3C that seat as viewed from above. As i clear from these drawings, substantially all portions of the sea tactiovisuaUy addressable from that passageway, the top 371 an front 372 of seat cushion 370, and the front portion 37G of sea back 375, are covered in a suitably fire-resistant tactiovisuaU distinctive material that makes it immediately recognizable as a exit row seat. One example of such a material is distinctivel colored wide wale corduroy cut and sewn to form the now familia vees that, like those of the floor-based tactiovisual exi passageway identifiers, point the way to the exit. Where leathe is the seat covering material of choice, seats can be mad tactiovisuaUy distinctive by selective sueding, stitching patching, dyeing, embossing, etc. The embodiment of FIG. 4 is an aisle seat the back of whic faces a passageway to an exit, say seat 9C in FIGS. 1 and 2; FIG 4A being that seat as viewed from the main aisle, FIG. 4B that sea as viewed from that passageway, and FIG. 4C that seat as viewe from above. This seat, like the seat of the FIG. 3 embodiment also flanks the inboard end of a passageway to an exit, and her too, as in the FIG. 3 embodiment, substantially all portions of th seat that are tactiovisuaUy addressable from that passageway ar covered in a suitably fire-resistant tactiovisuaUy distincti material , preferably the same material as are t passageway-addressable portions of the embodiment of FIG. Accordingly, the back 477 of seat back 475 and the adjoining pa 473 of seat cushion 470 are shown so covered in the drawings. Tray table 479, shown in its stowed position in the drawing is also tactiovisuaUy addressable from that passageway, and it t - 12- is shown with the now familiar vees on its face. This face, say suitably fire-resistant plastic laminate, is preferably colored a textured to mimic the look and feel of the guide strips and t exit passageway identifiers, but with the texture effected embossing rather than the other ways mentioned in the descripti of FIG. 5 to preserve the sanitary properties of the laminat Tray tables for all the other passenger seats, say tray table 3 of FIG. 3A for example, are also preferably so faced as well, the vees, of course, pointing the way to the nearest exit. While the descriptions of FIGS. 3 and 4 have been direc toward two specific seats, this special treatment is prefera accorded all of the seats flanking a passageway to an exit a when all such seats are so upholstered, virtually any passenger any seat can spot not only the nearest exit, but also an altern one. When an aircraft with seats so upholstered also includes tactiovisual exit passageway identifiers of FIG. 1, that aircr becomes one in which passengers walking, crawling on all fours, anything between, and under visual conditions ranging from nor to the smoke-compromised equivalent of total darkness, can find exits on their own. When these passengers choose their respective exits and paths to them on their own, they can, however, make choices t upset the smooth flow of traffic that is the heart of any effect evacuation plan. This compromised traffic flow and the result increase in evacuation time is addressed by the directional t tables and main aisle guide strips that tell passengers both their seats and in the aisle which way to go. These table tops guide strips direct passengers to exits assumed usable however, passengers directed toward exits that are blocked will, of course require special attention. This attention is provided by flig attendants freed for the task by passengers that are adequatel served by these directional elements and can get by on their own. The directional information supplied by the tray tables a the main aisle guide strips can also be displayed elsewhere, say the armrests of aisle seats where, as in FIG. 4C, it is sho displayed on the upper portion 491 of the aisle side armrest, or the aisle side panels of aisle seats where, as in FIG. 4A, it shown displayed as a strip 493 on that panel. When direction information is displayed on the armrests or side panels as show it is preferably displayed in the same way as on the tray table and for the same reasons. FIG. 5 is a sectional view of an otherwise convention aircraft floor covering material that has been modified to beco the preferred floor-based tactiovisual exit passageway identifie and guide strips of this invention. As shown in the section, tak normal to the legs of the vees of these identifiers or strip conventional aircraft cabin floor covering material 502, preferab having a color that is lighter than, and a good color and sha contrast with, the rest of the cabin floor, is grooved or otherwi modified to accommodate strips of abrasive material 504. The abrasive strips, say silicon carbide grains in a suitable bind and preferably dark enough for good visual contrast with respect both the material 502 and the rest of the floor, are preferably p into the embodiment of FIG. 5 at the time of manufacture, alternately, pressed, cast, or cemented into the previou mentioned grooves" later, say when the floor covering material - 14- iπsta l l ed . Abrasive strips 504 are preferably arranged in clusters, s the groups of three shown, between which are wider strips 506 material 502, an arrangement that helps to emphasize the v pattern. In the preferred embodiment the shades and colors of t cabin floor, the abrasive strips 504, and the material 502 whic in some aircraft, might be metal, would, of course, be those th best facilitate evacuation under emergency lighting conditions. E it passageway identifiers and guide strips in accordan with FIG. 5 are preferred to those in which the vees a tactiovisuaUy defined by selective modification of the floor the floor covering material alone, say by embossing, ribbin grooving, or, where carpeting is required, by sculpturing, or ev by imitations of FIG. 5 in which the abrasive strips are aircra quality versions of the anti-slip strips intended for boats bathtubs, because these other embodiments become less effective f the purposes of this invention as a result of wear, while the FI 5 embodiments become more so. Thus the abrasive strips 504 beco more tactilely recognizable as the softer material that surroun them is worn away, and that wear also purges the surface of soft material 502 of contaminants that would otherwise compromise visu recognition. These contaminants darken the abrasive strips to but because these abrasive strips are not as effectively purged contaminants by wear, visual contrast is further enhanced. The alternating strips of abrasive material 504 and the wi or narrow strips of floor covering material 506, 508 of embodiments of FIG. 5 are, of course, the vees of the floor-ba tactiovisual exit passageway identifiers and main aisle gui - 15- strips and, as mentioned, these vees preferably have straight le and right apex angles, and are oriented as shown in FIGS. 1 and to lead passengers to their nearest appropriate exits. This particular vee configuration and orientation is preferr because it serves its intended purpose most effectively. Straig legged vees are, for example, much easier to recognize tactile than are curved legged vees or arrows, and the directionali inherent in a well-defined apex angle is lost when these angl approach zero or 180 degrees. Further, the legs of the vees make 45 degree angle with respect to the direction of travel from a se aisle to a main aisle, along a main aisle, from a main aisle to passageway to an exit, and along that passageway, making the le of the vees not only easy to recognize tactilely along the pa from a seat to an exit, but also easy to distinguish from t scores and grooves made by defective food and beverage cart wheel cleaning equipment, luggage, etc. , or those intentional introduced to mask such wear. Thus the preferred embodiments of the key features of t passive tactiovisual exit finding system; the floor-based e passageway identifiers, the seats that flank the exit passagewa the main aisle directional strips, and the directional tray tab have been described. While these features satisfy 14 CFR 25.B11 in a way that no active system dependent upon lights, po supplies, and vision alone can, it should be noted that directional table tops and aisle strips appear to violate bidirectional implications of 14 CFR 25.812Ce) C ) . This appar violation can, of course, be addressed, say by replacing the ch of vees with a chain of bidirectional tactiovisual elements such 16 - the "diamonds" of FIG. 2, or simply by changing the vees in straight lines, but a far better approach would be the staging evacuation drills to find out which configuration works best. While the examples used to describe the key features of th invention are the hypothetical aircraft of FIGS. 1 and 2, the features are also applicable not only to aircraft having two ma passenger aisles and to those having exit passageways consecutive rows of seats, but also to land vehicles such as tho used to transport the visually handicapped, to trams or trains th run in tunnels, to windowless structures such as bomb shelter theaters, etc. With respect to aircraft, and using as examples FIGS. 1 and if a second pair of exit passageways were introduced between se rows 8 and 9, the seats of row 8 would be covered in accordan with FIG. 4, while the seats of row 9, which would have ex passageways at both front and back, would still look like FIG. seats from the back, but would be further modified to look li FIG. 3 seats from the front. For aircraft having two main aisle the drawings for such aircraft corresponding to the present FIGS. and 2 would be mirror-symmetrical versions of these drawings, wi the plane of reflection say between seat columns 0 and E and, course, with exit passageway identifiers 120, 140, 160, 220, 24 260 and their corresponding exits omitted. The tactiovisual exit finding system of this invention is only applicable to virtually any passenger aircraft; it is a "universal" in the sense that anyone who can follow the vees find the exits in any structure having this system and will be a to do so despite language or literacy problems, visual impairmen etc, but only if tactiovisual exit finding elements in th structure were recognizable as such. Thus vees that fluoresce an are illuminated to make them do so would be so recognizable, whil tactiovisual exit finding systems in which the tactile parts ar "bathtub" anti-slip strips stuck to the floor alongside aircraf passenger cabin floor lighting (the light strips of which ar visually recognizable even when the lights are off) might not be s recognizable even though they are within the scope of thi invention as defined by the claims. The floor lighting of the prior art can, however, complemen the tactiovisual exit finding systems of this invention withou compromising either. In FIG. 1, for example, light strip 190 i shown bisecting the vees of tactiovisual exit passageway identifie 150, flanking the vees of identifier 130, and on the aft side o identifier 110. To avoid confusion, however, only one of thes lighting-identifier arrangements would be used in practicing thi invention. FIG. 1 also shows the lighting strip offset with respect t the center of the main aisle as are these strips in most aircraft While this offset readily accommodates a main aisle centered guid strip like the one in FIG. 2, floor lighting corresponding to lig strip 190 of FIG. 1 has been omitted from FIG. 2 for clarity illustration. In practicing the present invention in structures such aircraft where panic bars are inappropriate and exit closu locking mechanisms are released by handles, tactiovisual vee arra can also be used to guide hands to these handles, and as adjunc • 18- to, or possible replacements for, the arrows of 14 CF 25.811 Ce)C4) . Vee arrays might also be appropriate adjuncts to, o replacements For, conventional wording on exit signs in structure where the present invention is practiced. Since these as well as other variations and modifications ar within the scope of the present invention, descriptions containe herein should be considered illustrative rather than limiting. In both these descriptions and the claims that follow, th term "tactiovisual" refers to an object or objects identifiable touch or sight, and the terms "exit passageway" or simpl "passageway" refer to the passageway to, but not necessari through, an exit.

Claims: [received by the international bureau on 22 April 1994(22.04.94); original claims 5,6,29 and 33 amended remaining claims unchanged (4 pages)] 1. A system for finding an exit passageway in a structure having a plurality of fixed seats arranged in rows served by at least one main aisle and at least one exit served by an exit passageway, said system comprising: a passive tactiovisual exit passageway identifier having a plurality of passive unidirectional tactiovisual means for both singly and collectively and both tactilely and visually identifying a direction to said at least one exit. 2. The exit passageway finding system of claim 1, wherein the direction identified by said passive unidirectional tactiovisual means is discernible through a shoe. 3. The exit passageway finding system of claim 1, wherein said exit passageway identifier is floor based and protrudes into said at least one main aisle. 4. The exit passageway finding system of claim 1, wherein said passive unidirectional tactiovisual means comprises alternating vee-shaped strips of abrasive material and similarly shaped strips of at least one of flooring and floor-covering material arrangedbetween adjacent ones of alternating vee-shaped strips of abrasive material embedded into at least one of a tactiovisuaUy contrasting flooring and tactiovisuaUy contrasting floor-covering material. 5. The exit passageway finding system of claim 4, wherein said alternating vee-shaped strips of abrasive material are arranged in a nested configuration. 6. The exit passageway finding system of claim 1, further comprising floor-based electric illumination means for providing illumination, at least a portion of which is in illuminative proximity to said passive tactiovisual exit passageway identifier. 7. A system for finding an exit passageway in a structure having a plurality of fixed seats arranged in rows served by at least one main aisle and at least one exit served by an exit passageway, said system comprising: an exit-passageway-floor-based passive tactiovisual exit passageway identifier and a main- aisle floor-based passive tactiovisual main aisle guide strip both having a plurality of passive unidirectional tactiovisual means for both singly and collectively and both tactilely and visually identifying a direction to said at least one exit. 8. The exit passageway finding system of claim 7, wherein the direction identified by said passive unidirectional tactiovisual means is discernible through a shoe. 9. The exit passageway finding system of claim 7, wherein said exit passageway identifier protrudes into said at least one main aisle. 10. The exit passageway finding system of claim 7, wherein said passive unidirectional 29. The family of passive tactiovisual exit aids of claim 26, wherein said passive unidirectional tactiovisual first flooring means of said exit passageway identifier comprise alternating vee-shaped strips of abrasive material and similarly shaped strips of at least one of flooring and floor- covering material arranged between adjacent ones of said vee-shaped strips of abrasive material embedded into at least one of a tactiovisuaUy contrasting floor and tactiovisuaUy contrasting floor-covering material. 30. The family of passive tactiovisual exit aids of claim 26, wherein at least one of said armrest, said side panel, and said tray table is selectively textured and colored to identify the direction to said exit passageway and to facilitate their identification as one family member of said family of passive tactiovisual exit aids. 31. The family of passive tactiovisual exit aids of claim 26, wherein said upholstery is a waled fabric cut and sewn to provide the passive unidirectional tactiovisual upholstery means for identifying the direction to said exit and for facilitating identification as one family member of said family of passive tactiovisual exit aids. 32. The family of passive tactiovisual exit aids of claim 26, wherein said upholstery is at least one of leather and leather-like material, selected portions of which are at least one of sueded, stitched, patched, embossed, and dyed to provide the passive unidirectional tactiovisual upholsterymeans for identifying the direction to said exit and for facilitating identification as one family member of said family of passive tactiovisual exit aids. 33. The family of passive tactiovisual exit aids of claim 26, further comprising floor-based electric illumination means for providing illumination, and in illuminative proximity to said floor-based passive tactiovisual exit passageway identifier and said floor-based passive tactiovisual main aisle guide strip.

Inventors: HONIGSBAUM RICHARD F, HONIGSBAUM, RICHARD, F.
Applicants: HONIGSBAUM RICHARD F, HONIGSBAUM, RICHARD, F.
Application year: 1994
Main classification: G01B1
IPC codes: A62B3, B64D11, B64D25